What the Automatic Battery Trickle Charger 12V/24V does
A standby generator battery slowly discharges while it waits. A mains-powered trickle charger keeps it topped up, so the set starts first time when the power fails.
This 3-stage charger charges fast when the battery is low, then drops to a float voltage that holds it full without boiling it dry — which matters in hot generator rooms.
Signs it needs replacing
- Generator batteries going flat between runs.
- Charge-failure alarm, or charger indicator lights off.
- Batteries hot, swollen or losing electrolyte (overcharging).
Get the right part first time
Send us these on WhatsApp and our engineers will confirm the exact part before you pay:
- Your battery system voltage (12 V or 24 V).
- Whether there is a mains supply at the generator.
Fitting notes
The charger is supplied from mains and connected across the battery, usually through the control panel. It must be on a protected circuit and wired so it is not back-fed when the generator runs.
Frequently asked questions
Does the generator's own alternator charge the battery?+
Only while the engine runs. A standby set runs too rarely for that to keep the battery full — that is the charger's job.
Can it stay connected all the time?+
Yes. In float mode it holds the battery full without overcharging.
Will it work on 24 V systems?+
Yes — it switches between 12 V and 24 V.